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OpenDarwin 7.2.1 - man page for comm (opendarwin section 1)

COMM(1) 			   BSD General Commands Manual				  COMM(1)

NAME
     comm -- select or reject lines common to two files

SYNOPSIS
     comm [-123i] file1 file2

DESCRIPTION
     The comm utility reads file1 and file2, which should be sorted lexically, and produces three
     text columns as output: lines only in file1; lines only in file2; and lines in both files.

     The filename ``-'' means the standard input.

     The following options are available:

     -1      Suppress printing of column 1.

     -2      Suppress printing of column 2.

     -3      Suppress printing of column 3.

     -i      Case insensitive comparison of lines.

     Each column will have a number of tab characters prepended to it equal to the number of
     lower numbered columns that are being printed.  For example, if column number two is being
     suppressed, lines printed in column number one will not have any tabs preceding them, and
     lines printed in column number three will have one.

     The comm utility assumes that the files are lexically sorted; all characters participate in
     line comparisons.

DIAGNOSTICS
     The comm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO
     cmp(1), diff(1), sort(1), uniq(1)

STANDARDS
     The comm utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').

HISTORY
     A comm command appeared in Version 4 AT&T UNIX.

BSD					   June 6, 1993 				      BSD


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